v0.4.0 release plan

Features:

• [ ] Cell as SKU in intra-vc scheduler. @abuccts #34
  • [x] Spec and algorithm design.
  • [x] Intra-vc implementation.
  • [ ] End-to-end tests.
  • [ ] Document and test cases.
• [ ] Visualizations, including physical cluster, virtual cluster, jobs, etc. @hzhua
  • [x] Visualization prototype.
  • [ ] UX design.
  • [ ] Webportal implementation.